JPH0995121A - Air conditioning mechanism for vehicle with cabin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seaparately introduce the inside air and the outside air into a cabine by connecting the terminal parts of a cabin-inside air introducing duct and an outside air introducing duct respectively to the inlet of a blower of an air-conditioning device provided in the car body outside the cabin in order to blow out the air in the duct provided in the cabin. SOLUTION: In a ceiling part of an intake duct 1a at the inlet part of a shielding plate 2, a front stopper 2c is hung to the front part and a rear stopper 2d is hung to the rear part, and a shutter 3 can be switched to a state where it abuts on the front stopper 2c and a state where it abuts on the rear stopper 2d. The hanged position of the front stopper 2c is located close to the front end of the inlet part of a blower BL, and the entire inlet part of the blower BL is connected to a cabin-inside air intake duct part formed in the rear of the the intake duct 1a in state where the shutter 3 abuts on the front stopper 2c. The outside air introduced from the front side of the intake duct 1a is shielded by the shutter 3 not to be sucked in the inlet of the blower BL.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vehicle with a cabin,
The present invention mainly relates to a suction duct-related structure in an air conditioning mechanism of a tractor with a cabin, which has a structure capable of selectively sucking inside air and outside air of the cabin.

[0002]

2. Description of the Related Art In a vehicle with a cabin, for example, a tractor with a cabin, an air conditioner is installed in the ceiling of the cabin.
A structure in which outside air can be introduced from the ceiling and an air conditioner is provided in the bonnet, and the air inside the cabin is taken into the bonnet and circulated through the air conditioner again to be circulated. Is known, and the latter is disclosed in Japanese Patent Laid-Open No.
-47832 or U.S. Pat. No. 4,467,706.
No. 6,086,045.

In the former publication, a chamber for installing an air conditioner is provided in the hood of a tractor, and a duct for introducing the inside air of the cabin and a duct for introducing the outside air are connected to the chamber, and each duct is opened and closed. By providing a switchable shutter, the inside or outside air of the cabin taken into the room can be sucked into a blower of an air conditioner installed inside the room. In the latter publication, separate blowers are provided for introducing outside air and cabin air, and an evaporator is arranged on the lower side of both blowers in the air conditioner to air-condition the air from both blowers, and the respective blowers to the evaporator. A discharge duct for the outside air and a discharge duct for the inside air of the cabin are juxtaposed on the lower side of the evaporator so that the air taken in and discharged can be independently taken in, and can be opened and closed at the respective discharge duct inlets. A shutter is provided.

[0004]

When the air conditioner is installed on the ceiling of the cabin, the outside air is introduced from a high place, so that the air is relatively clean, but there is a problem that the living space of the cabin is narrowed. . If it is installed inside the bonnet, there is an advantage that the space inside the cabin becomes wider. However, since it is disadvantageous in terms of introducing outside air (the air is dirty because it is introduced from a low place), the bonnet-installed type is mainly the type that circulates the cabin inside air for air conditioning. However, if only the air circulation in the cabin occurs, there is a problem that dust is sucked into the cabin from the air conditioning duct due to the negative pressure inside the cabin as compared to the inside of the bonnet. Further, when the air in the cabin is hotter than the outside air at the beginning of riding, it is more effective to cool the outside air. Therefore, when the inside of the cabin is contaminated with dust or cigarette smoke, the outside air is taken in as air for air conditioning to pressurize the inside of the cabin to prevent the entry of dust and the like, and to improve the cooling capacity. As described in the above publication, outside air can be taken in.

However, the above-mentioned technique disclosed in the latter publication is high in cost because two blowers are provided.
In addition, there is a problem that the installation space is limited. The technique disclosed in the former publication has a configuration in which the inside air and the outside air of the cabin are introduced into one blower, but the introduced air of the blower is the indoor air. Therefore, when both the cabin inside air and the outside air are desired to be taken in and both shutters of each duct are opened, the cabin inside air and the outside air are mixed in the room. In this case, in the outside air intake duct, a filter having a relatively high resistance is arranged in order to clean the outside air with a large amount of dirt, so that the introduction pressure of the outside air is low and the inside air of the cabin with high pressure is A large amount is introduced, and the amount of outside air introduced into the room becomes smaller than the amount of introduction that corresponds to the degree of opening of the shutter. Therefore,
It is desirable that the cabin air and the outside air are independently introduced on the blower suction side so that the introduction of the outside air is not hindered by the introduction of the cabin air. Further, in the case of the technique disclosed in the publication, two shutters must be prepared for the cabin air intake duct and the cabin air intake duct.
Since a configuration in which both shutters are interlocked is required, the cost is high and the assembly configuration is difficult.

[0006]

The present invention uses the following means in order to solve the above problems. That is, in the air-conditioning mechanism of a vehicle with a cabin as claimed in claim 1, in order to blow out the air-conditioning air to the duct provided in the cabin, the air blower inlet of the air-conditioning device provided in the vehicle body outside the cabin is used for inhaling the air in the cabin. The end portions of the duct and the outside air intake duct are connected together.

According to a second aspect of the present invention, in an air conditioning system for a vehicle with a cabin, in order to blow out air conditioning air into a duct provided inside the cabin, the cabin is provided at a blower inlet of an air conditioner provided outside the cabin. A shutter that connects the end portions of the inside air intake duct and the outside air intake duct and separates each end portion is provided, and the shutter introduces only the inside air of the cabin into the blower inlet, and the inside and outside air of the cabin. It is configured to be able to switch to the state of introducing.

Further, in a vehicle with a cabin according to a third aspect of the present invention, in order to blow out air conditioning air to a duct provided inside the cabin, an outside air intake duct is provided to a blower of an air conditioner installed inside the vehicle body outside the cabin. A step is provided on the.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is an overall side view of the tractor with a cabin, FIG. 2 is a plan view of the same, FIG. 3 is a front view of the same, FIG. 4 is an internal side view of a hood B mainly showing an air conditioning mechanism, and FIG. 5 is a plan view of the same. Is a rear view of the same, FIG. 7 is a side view showing the structure of the shutter 3 inside the intake duct 1a at the inlet of the blower BL, FIG. 8 is a plan view of the same, and FIG. 9 is a view showing the shielding plate 2 attached below the blower BL. , (A) is a plan view, (b) is a side view, FIG. 10 is an internal front view of a bonnet B forming an outside air intake port, and FIG. 11 is an inside air filter 13.
12 is a side view of the mounting portion of FIG. 12, FIG. 12 is a rear view of the same, FIG. 13 is a plan view of the dashboard DB portion in the cabin C showing the arrangement structure of the discharge ducts 19 and 20 and the defroster 22, and FIG. It is a front view of the bellows hose 21 branched from it.

The entire structure of the tractor with a cabin will be described with reference to FIGS. 1 to 3. On the chassis CH that suspends the front wheels FW and the rear wheels RW, an engine E is installed in the front part on the chassis CH. A hood B is mounted, and a cabin C is mounted at the rear, and a dashboard DB is formed at the rear end of the hood B at the front inside the cabin C, as shown in FIGS. 4 and 13. The discharge duct 19 described later
・ 20 is installed internally. Further, a bonnet cover Ba that can be rotated up and down is attached to the upper portion of the bonnet B, and a windshield FG is fitted on the front surface of the cabin C.

The overall construction of the air conditioning mechanism will be described with reference to FIGS. 4 to 6. The air conditioner, that is, the air conditioner unit A is configured by continuously integrating the blower BL and the evaporator EV, and is arranged above the engine E in the hood B. The upper part of the air conditioning unit A is covered with a bonnet cover Ba, and the bonnet cover Ba can be rotated upward to open the inside, so that the air conditioning unit A can be easily opened.
The maintenance work can be done. A radiator R is arranged in front of the engine E, and a refrigerant tank CT and a refrigerant compressor CC are arranged further in front of the radiator R, and a refrigerant pipe CP is piped from the refrigerant compressor CC to the evaporator EV of the air conditioning unit A. Has been done.

The duct structure of the air conditioning mechanism will be described.
First, on the discharge side, the discharge duct 18 is extended to the lower side of the evaporator EV, is fitted into the dashboard DB via the rear shield plate 16 described later, and the upper discharge duct 19 is inserted in the dashboard DB. And the left and right lower discharge ducts 20 and 20 are branched to discharge the conditioned air into the cabin C room. The discharge air is
It is shown by a white arrow in FIG.

Ventilation from the upper discharge duct 19 is blown toward the driver's face from the upper part of the dashboard DB as shown in FIGS. 4 and 13, and the left and right lower discharge ducts 20.2.
Ventilation from 0 is blown toward the driver's feet from below the dashboard DB. Furthermore, each lower discharge duct 2
As shown in FIGS. 13 and 14, a bellows hose 21 for extracting air is extended outward from the middle part of 0.20, and at least one bellows hose 21 is attached to the windshield FG of the cabin C. The defroster 22 is connected to the defroster 22, and the conditioned air is blown out from the defroster 22 to defrost and defrost the windshield FG.

On the other hand, the suction duct 1a to the blower BL is
It is arranged immediately below the air conditioning unit A (immediately above the engine E), the front is formed for intake of outside air, and the rear is formed for intake of air in the cabin. At the blower inlet formed on the lower surface of the blower BL. The outside air and the air inside the cabin are introduced. In the blower BL, the outside air and the inside air of the cabin are separated by the shutter 3.

Now, the structure of the suction duct 1a will be described. The air-conditioning case 1 forms the suction duct 1a.
It is. As shown in FIG. 6, the upper portion of the air conditioning case 1 is concave in a front view (rear view) to form an air conditioning unit receiving portion 1b which serves as a tray on the bottom surface of the air conditioning unit A. A sealing material 7 is attached to the bottom surface of the air conditioning unit A along the upper edge of the suction duct 1a, which is formed by recessing the bottom of the air conditioning unit receiving portion 1b as described later. The sealing material 7 is interposed between the bottom surface of the air conditioning unit receiving portion 1b and the bottom surface of the air conditioning unit receiving portion 1b so that the air flowing through the suction duct 1a, which will be described later, is separated from the room air formed in the air conditioning unit receiving portion 1a. Has become. The sealing material 7 is an air conditioning unit A
It also serves as the anti-vibration support member. Thus, the bottom surface and the side surface of the chamber in which the air conditioning unit A is installed (hereinafter referred to as the "air conditioning unit chamber") are formed in the air conditioning unit receiving portion 1b, and the bonnet cover on which the sealing material 8 is attached is formed on the upper side. The air-conditioning unit room is covered with Ba, is completely sealed, and has a high heat insulation effect.

Further, in the vicinity of the center of the bottom surface of the air-conditioning unit receiving portion 1b, the front-rear length is narrower than the air-conditioning unit A in lateral width, and it is recessed downward to form the bottom surface and both side surfaces of the suction duct 1a. ing. The bottom surface of the air conditioning unit A supported by the air conditioning unit receiving portion 1b covers the upper part of the suction duct 1a. A heat insulating material 6 is attached to the outer surface of the air conditioning case 1, and an aluminum foil is further attached to the outer surface thereof to insulate residual heat from the engine E below. Since the air conditioning unit A arranged in the air conditioning unit chamber formed by the portion 1b and the like is arranged with the intake duct 1a separated from the engine E, the heat insulation effect on the air conditioning unit A is It gets even higher.

The rear end of the air conditioning case 1 has a rear shielding plate 1
6, the rear end of the suction duct 1a is connected to the cabin air intake duct 17 via the rear shielding plate 16, and the rear end opening of the cabin air intake duct 17 is a dashboard DB. It is located in the cabin and takes in the cabin air. In the suction duct 1a, a lower portion of the evaporator EV is a suction duct portion for cabin air introduced through the cabin air suction duct 17. Figure 4 shows the flow of air inside the cabin.
The middle and thick arrows are shown.

On the other hand, in the front part of the air conditioning case 1,
Air conditioning unit receiving portion 1b in the front part of the blower BL
A step portion 1c having a high front side is formed on the bottom surface of the. The suction duct 1a below the step portion 1c is
It is an outside air intake duct portion from the front, and its front end is open, and the outside air intake duct 9 is made of a rubber material.
Are connected to. The front end of the outside air intake duct 9 is connected to the outside air filter 10 fitted inside a seal case 11 arranged to cover the upper portion of the radiator R as shown in FIGS. 4 and 5. The front side forms the outside air intake. The flow of outside air is indicated by a thin arrow in FIG.

The seal case 11 has a box shape,
The front end portion is a front end blocking plate portion 11a having a vertical surface as shown in FIG. 10, and the outside air filter 10 is provided on the rear surface thereof.
The outer air filter 10 can be easily attached to and detached from the seal case 11.
The outside air filter 10 is made of a non-woven fabric and can be washed with water. Further, the outside air intake ports 11b, 11b, 11b are formed in the front end blocking plate portion 11a, and the outside air is taken in through the outside air intake ports 11b. Between the lower end of the seal case 11 and the upper end of the radiator R, as shown in FIG.
2 is interposed to block heat conduction between the front of the radiator R and the engine room.

In the step portion 1c in front of the blower BL in the air conditioning case 1, the upper portion of the suction duct 1a is open, and the air conditioning unit chamber and the suction duct 1a are in communication with each other. ing. Therefore, FIG.
The shielding plate 2 having such a configuration is disposed on the bottom surface of the air conditioning unit receiving portion 1b of the air conditioning case 1 to shield the upper end opening of the suction duct 1a. As shown in FIG. 5, a step portion 2a is formed in the front portion of the shielding plate 2 along the step portion 1c, and in the rear portion, a blower hole is formed so that the lower end inlet portion of the blower BL is fitted therein. 2b is provided. In this way, the inside of the suction duct 1a and the air conditioning unit chamber formed by the air conditioning unit receiving portion 1b thereabove are completely isolated, and the air in the suction duct 1a is fitted into the blower hole 2b of the shielding plate 2. It is only sucked into the blower BL via the inlet portion of the blower BL.

The step portion 1c forms the ceiling portion of the outside air suction duct portion, and the dust in the outside air that remains even after passing through the outside air filter 10 hits the step portion 1c and adheres to this portion. To do. In this way, the outside air with dust removed at the step portion 1c reaches below the inlet of the blower BL, so that the intake of the blower can be cleaned.

Returning to the cabin air intake portion of the intake duct 1, the interior air filter 13 will be described. The inside air filter 13 has a screen shape as shown in FIGS. On the other hand, a lateral lower rail 15 is fixedly installed on the bottom surface of the suction duct 1a, and above the air conditioning unit receiving portion 1b, the rail 15 is suspended above the lower rail 15 so as to hang down from the upper end opening of the suction duct 1a. A horizontal upper rail 14 is provided. The inside air filter 13 is sandwiched by an upper rail 14 and a lower rail 15 so as to be vertically slidable. Further, in the suction duct 1a, one end portion of the upper rail 14 and the lower rail 15 vertically moves. A slit 1d is provided in the direction so that the inside air filter 13 can be freely inserted and removed. When replacing the inside air filter 13,
The side portion of the bonnet B is opened, and the inside air filter 13 fitted inside the suction duct 1a is pulled out from the slit 1d.

The internal structure of the suction duct 1a at the inlet of the blower BL will be described with reference to FIGS. In FIG. 7, the inside air of the cabin at the intake of the blower is shown by a white arrow, the outside air is shown by a hatched arrow, and the blower discharge air is shown by a thick black arrow.

A hinge 3a is attached to the bottom of the suction duct 1a.
A shutter 3 is provided so as to be rotatable in the front-back direction via a link 3a. The shutter 3 is a circle of a disc 5a fixed to a motor shaft of a shutter driving motor 5 via a link 4. The disk 5a is pivotally connected to a part of the peripheral portion, and is driven by a motor to rotate the disk 5a to move the front-rear position of the link 4 and to be driven to rotate back and forth.

At the ceiling portion of the suction duct 1a at the blower inlet portion of the shielding plate 2, as shown in FIG.
A front stopper 2c is provided at the front and a rear stopper 2 is provided at the rear.
The shutter 3 is set so that it can be switched between a state in which it contacts the front stopper 2c and a state in which it contacts the rear stoppers 2d and 2d. The vertical position of the front stopper 2c is in the vicinity of the front end of the inlet of the blower BL, and when the shutter 3 is in contact with the front stopper 2c in the X state in FIG. The air inside the cabin formed in the rear of the suction duct 1a communicates with the air, and the outside air introduced from the front of the suction duct 1a is blocked by the shutter 3 and is not sucked into the blower BL inlet. That is, this state is a state in which only the air inside the cabin is set to circulate in the air conditioner. The white arrow W1 in FIG. 7 indicates the shutter 3
Shows the flow of air inside the cabin only when X is in the X state.

On the other hand, the rear stoppers 2d and 2d are located slightly in front of the center of the blower BL inlet, and in the Y state in FIG. 7 in which the shutter 3 is brought into contact with the rear stoppers 2d and 2d, the blower inlet is located. The rear of the shutter 3 is an inlet for the air inside the cabin, and the front is an inlet for the outside air. The areas of the respective inlets are such that the inside air inlet of the cabin is 7 and the outside air inlet area is 3, for example. At this time, the flow of outside air flowing toward the inlet of the blower BL is indicated by the hatched arrow W2 in FIG.

Then, as described above, the central portion of the inlet portion of the blower BL (in FIG. 7, the blower center line is CL).
Is located behind the shutter 3, that is, facing the inside air intake port of the cabin, and the central portion has the strongest suction force, and thus sucks the inside air of the cabin at a high speed. The outside air sucked in from a portion slightly forward of this portion is lower in pressure than the inside air of the cabin by passing through the outside air filter 10 having a strong resistance as described in "Problems to be Solved by the Invention". By positioning the shutter 3 as in the embodiment, the air inside the cabin is quickly sucked in the central portion of the blower BL, so that the outside air sucked in front of it is pushed out to prevent the suction of outside air in the blower BL. There is no. Therefore, the outside air can be smoothly sucked in, and it is possible to satisfactorily obtain the pressure increase in the cabin and the improvement of the cooling capacity, which are the purposes of inhaling the outside air.

[0028]

Since the present invention is constructed as described above with respect to the intake duct of the air conditioning mechanism in the vehicle with the cabin, it has the following effects. That is, in the structure according to the first aspect, both the inside air and the outside air can be sucked into one blower, and it is not necessary to separately provide the blower for the inside air and the outside air, and the cost can be suppressed.
Then, the inside air and outside air are taken into the room where the air conditioner is installed, and the air-fuel mixture inside the room is not sucked into the blower inlet, but the cabin inside air intake duct and the outside air are sucked into the blower inlet. Since the suction duct is directly connected, the inside air and the outside air of the cabin can be independently sucked into the blower, and the outside air having a lower pressure than the inside air of the cabin is blown to the blower. The problem of being hindered from being introduced into the cabin has been resolved, the set amount of outside air can be satisfactorily sucked in, and the pressurization inside the cabin can be realized by introducing outside air, and dust inside the cabin mixed with the air-conditioning discharge air can be realized. To prevent the intrusion of
The air-conditioning capacity can be increased depending on the outside air temperature.

According to the second aspect of the present invention, when both the cabin air and the outside air are sucked into the blower, the cabin inside air and the outside air are reliably separated by the shutter at the blower inlet. By being inhaled, the effect of introducing the outside air is further ensured.

By providing a step portion in the outside air intake duct as in claim 3, dust in the outside air that cannot be removed through the filter can be removed by the step portion.
It is possible to further purify the outside air before inhaling the blower,
This not only enhances the effect of preventing dust from entering the cabin, but also improves the durability of the air conditioner.

[Brief description of drawings]

FIG. 1 is an overall side view of a tractor with a cabin.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is an internal side view of a bonnet B mainly showing an air conditioning mechanism.

FIG. 5 is a plan view of the same.

FIG. 6 is a rear view of the same.

FIG. 7 is a side view showing the configuration of the shutter 3 inside the suction duct 1a at the inlet of the blower BL.

FIG. 8 is a plan view of the same.

9A and 9B are views showing a shielding plate 2 attached below the blower BL, FIG. 9A is a plan view, and FIG. 9B is a side view.

FIG. 10 is an internal front view of a bonnet B forming an outside air intake port.

FIG. 11 is a side view of a mounting portion of an inside air filter 13.

FIG. 12 is a rear view of the same.

FIG. 13 is a plan view of a dashboard DB portion in the cabin C showing the arrangement structure of the discharge ducts 19 and 20 and the defroster 22.

FIG. 14 is a front view of a lower discharge duct 20 and a bellows hose 21 branched therefrom.

[Explanation of symbols]

 A Air Conditioning Unit B Bonnet C Cabin BL Blower EV Evaporator 1 Air Conditioning Case 1a Intake Duct 1b Air Conditioning Unit Receiving Part 1c Step Part 2 Blocking Plate 2a Step Part 2b Blower Hole 2c Front Stopper 2d Rear Stopper 3 Shutter 4 Link 5 For Driving the Shutter motor

Claims (3)

[Claims] 1. In an air conditioning system for a vehicle with a cabin, in order to blow out air conditioning air into a duct provided in the cabin, a duct for intake of air inside the cabin and an outside air are provided at a blower inlet of an air conditioner installed inside the vehicle body outside the cabin. An air conditioning system for a vehicle with a cabin, characterized in that each end of an intake duct is connected. 2. In an air conditioning system for a vehicle with a cabin, in order to blow out air conditioning air into a duct disposed inside the cabin, a duct for intake of air inside the cabin and an outside air are provided at a blower inlet of an air conditioner installed inside the vehicle body outside the cabin. A shutter for connecting each end of the suction duct and partitioning each end is provided, and the shutter has a state in which only the cabin air is introduced into the blower inlet and a state in which the cabin air and the outside air are introduced. An air conditioning mechanism for vehicles with a cabin that can be switched. 3. In a vehicle with a cabin, a step portion is provided in the outside air intake duct with respect to a blower of an air conditioner installed inside the vehicle body outside the cabin in order to blow out the air conditioning air into the duct provided in the cabin. An air conditioning system for a vehicle with a cabin, which is characterized in that